Added loading many pages on scroll bottom event.

app/src/main/java/pl/tpolgrabia/urbanexplorer/adapters/PlacesAdapter.java

@@ -1,6 +1,7 @@
 package pl.tpolgrabia.urbanexplorer.adapters;
 
 import android.content.Context;
+import android.graphics.BitmapFactory;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -22,11 +23,9 @@ import java.util.List;
  */
 public class PlacesAdapter extends ArrayAdapter<GooglePlaceResult> {
 
-    private final GooglePlacesResponse objects;
 
-    public PlacesAdapter(Context context, GooglePlacesResponse objects) {
+    public PlacesAdapter(Context context, List<GooglePlaceResult> objects) {
-        super(context, R.layout.google_place_item, objects.getPlaces());
+        super(context, R.layout.google_place_item, objects);
-        this.objects = objects;
     }
 
     @Override
@@ -40,6 +39,10 @@ public class PlacesAdapter extends ArrayAdapter<GooglePlaceResult> {
         }
 
         GooglePlaceResult item = getItem(position);
+        if (item.getId().equals(resultView.getTag())) {
+            return resultView;
+        }
+
         final List<GooglePlacePhoto> photos = item.getPhotos();
         String photoRef = photos != null && !photos.isEmpty() ? photos.get(0).getPhotoReference() : null;
         String photoUrl = photoRef == null ? null : "https://maps.googleapis.com/maps/api/place/photo?photoreference="
@@ -55,12 +58,16 @@ public class PlacesAdapter extends ArrayAdapter<GooglePlaceResult> {
         placeRateWidget.setText("" + item.getRating());
 
         ImageView placePreviewWidget = (ImageView)resultView.findViewById(R.id.place_img_preview);
+        placePreviewWidget.setImageBitmap(BitmapFactory.decodeResource(getContext().getResources(), R.drawable.noimage));
+
 
         ImageLoader.getInstance().displayImage(
             photoUrl != null ? photoUrl : item.getIcon(),
             placePreviewWidget,
             MainActivity.options);
 
+        resultView.setTag(item.getId());
+
         return resultView;
     }
 }

app/src/main/java/pl/tpolgrabia/urbanexplorer/dto/GooglePlacesResponse.java

@@ -10,6 +10,9 @@ import java.util.List;
 public class GooglePlacesResponse {
     private List<GooglePlaceResult> places;
 
+    private String nextPageToken;
+    private String originalPageToken;
+
     public List<GooglePlaceResult> getPlaces() {
         return places;
     }
@@ -18,10 +21,28 @@ public class GooglePlacesResponse {
         this.places = places;
     }
 
+    public String getNextPageToken() {
+        return nextPageToken;
+    }
+
+    public void setNextPageToken(String nextPageToken) {
+        this.nextPageToken = nextPageToken;
+    }
+
+    public void setOriginalPageToken(String originalPageToken) {
+        this.originalPageToken = originalPageToken;
+    }
+
+    public String getOriginalPageToken() {
+        return originalPageToken;
+    }
+
     @Override
     public String toString() {
         return "GooglePlacesResponse{" +
             "places=" + places +
+            ", nextPageToken='" + nextPageToken + '\'' +
+            ", originalPageToken='" + originalPageToken + '\'' +
             '}';
     }
 }

app/src/main/java/pl/tpolgrabia/urbanexplorer/fragments/PlacesFragment.java

@@ -8,13 +8,15 @@ import android.support.v4.app.Fragment;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.widget.ListAdapter;
 import android.widget.ListView;
 import android.widget.TextView;
-import org.apache.http.HttpStatus;
+import org.greenrobot.eventbus.EventBus;
+import org.greenrobot.eventbus.Subscribe;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import pl.tpolgrabia.googleutils.callback.LocationGeoCoderCallback;
-import pl.tpolgrabia.googleutils.callback.PlacesCallback;
+import pl.tpolgrabia.googleutils.constants.GooglePlacesConstants;
 import pl.tpolgrabia.googleutils.dto.GooglePlaceResult;
 import pl.tpolgrabia.googleutils.utils.GeocoderUtils;
 import pl.tpolgrabia.googleutils.utils.PlacesUtils;
@@ -24,11 +26,15 @@ import pl.tpolgrabia.urbanexplorer.MainActivity;
 import pl.tpolgrabia.urbanexplorer.R;
 import pl.tpolgrabia.urbanexplorer.adapters.PlacesAdapter;
 import pl.tpolgrabia.urbanexplorer.dto.GooglePlacesRequest;
+import pl.tpolgrabia.urbanexplorer.dto.GooglePlacesResponse;
+import pl.tpolgrabia.urbanexplorer.handlers.GooglePlacesScrollListener;
 import pl.tpolgrabia.urbanexplorer.worker.GooglePlacesWorker;
 import pl.tpolgrabia.urbanexplorerutils.callbacks.StandardLocationListenerCallback;
 import pl.tpolgrabia.urbanexplorerutils.utils.LocationUtils;
 
+import java.util.ArrayList;
 import java.util.List;
+import java.util.concurrent.Semaphore;
 
 
 /**
@@ -40,12 +46,22 @@ public class PlacesFragment extends Fragment {
     public static final String TAG = PlacesFragment.class.getSimpleName();
     private PlacesUtils placesUtils;
     private GeocoderUtils geocoderUtils;
-    private GooglePlacesWorker worker;
+    private String nextPageToken;
+    private List<GooglePlaceResult> places = new ArrayList<>();
+
+    private Semaphore semaphore = new Semaphore(1);
+    private boolean finished = false;
 
     public PlacesFragment() {
         // Required empty public constructor
     }
 
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        EventBus.getDefault().register(this);
+    }
 
     @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container,
@@ -53,6 +69,9 @@ public class PlacesFragment extends Fragment {
         // Inflate the layout for this fragment
         final View inflatedView = inflater.inflate(R.layout.fragment_places, container, false);
 
+        ListView placesWidget = (ListView) inflatedView.findViewById(R.id.google_places);
+        placesWidget.setOnScrollListener(new GooglePlacesScrollListener(this));
+
         return inflatedView;
     }
 
@@ -103,7 +122,6 @@ public class PlacesFragment extends Fragment {
             });
 
         geocoderUtils = new GeocoderUtils(getActivity(), AppConstants.GOOGLE_API_KEY);
-        worker = new GooglePlacesWorker(getActivity(), this);
 
     }
 
@@ -139,30 +157,73 @@ public class PlacesFragment extends Fragment {
     }
 
     private void fetchNearbyPlacesAndPresemt(Location location) {
+        if (!semaphore.tryAcquire()) {
+            // running
+            return;
+        }
+
         GooglePlacesRequest request = new GooglePlacesRequest();
         request.setLocation(location);
         request.setSearchRadius(AppConstants.DEF_PLACES_RADIUS);
-        request.setSearchItemType("museum");
+        request.setSearchItemType(GooglePlacesConstants.PLACES_SEARCH_TYPE);
-        worker.execute(request);
+        new GooglePlacesWorker(getActivity(), this).execute(request);
+    }
 
-//        placesUtils.fetchNearbyPlaces(
+    public void loadNextPage() {
-//            location.getLatitude(),
+
-//            location.getLongitude(),
+        if (!semaphore.tryAcquire()) {
-//            AppConstants.DEF_PLACES_RADIUS,
+            // running
-//            "museum",
+            return;
-//            null,
+        }
-//            new PlacesCallback() {
+
-//                @Override
+        if (finished) {
-//                public void callback(Long statusCode, String statusMsg, List<GooglePlaceResult> googlePlaceResult) {
+            semaphore.release();
-//                    lg.debug("Fetch nearby statusCode: {}, status message: {}, google result: {}",
+            return;
-//                        statusCode,
+        }
-//                        statusMsg,
+
-//                        googlePlaceResult);
+        lg.debug("Loading next page");
-//
+
-//                    ListView googlePlacesWidget = (ListView) getView().findViewById(R.id.google_places);
+        Location location = LocationUtils.getLastKnownLocation(getActivity());
-//                    PlacesAdapter adapter = new PlacesAdapter(getActivity(), googlePlaceResult);
+        GooglePlacesRequest request = new GooglePlacesRequest();
-//                    googlePlacesWidget.setAdapter(adapter);
+        request.setLocation(location);
-//                }
+        request.setSearchRadius(AppConstants.DEF_PLACES_RADIUS);
-//            });
+        request.setSearchItemType(GooglePlacesConstants.PLACES_SEARCH_TYPE);
+        request.setPageToken(nextPageToken);
+        new GooglePlacesWorker(getActivity(), this).execute(request);
+    }
+
+    public void setNextPageToken(String nextPageToken) {
+        this.nextPageToken = nextPageToken;
+    }
+
+    @Subscribe
+    public void handleGooglePlacesResult(GooglePlacesResponse response) {
+        lg.debug("Handling google places results with original {} and next page token {}",
+            response.getOriginalPageToken(),
+            response.getNextPageToken());
+
+        ListView placesWidget = (ListView) getView().findViewById(R.id.google_places);
+        if (nextPageToken == null) {
+            places = response.getPlaces();
+            PlacesAdapter adapter = new PlacesAdapter(getActivity(), places);
+            placesWidget.setAdapter(adapter);
+        } else {
+            places.addAll(response.getPlaces());
+            PlacesAdapter adapter = (PlacesAdapter)placesWidget.getAdapter();
+            adapter.addAll(places);
+        }
+
+        nextPageToken = response.getNextPageToken();
+        if (nextPageToken == null) {
+            finished = true;
+        }
+        semaphore.release();
+    }
+
+    @Override
+    public void onDestroy() {
+        super.onDestroy();
+
+        EventBus.getDefault().unregister(this);
     }
 }

app/src/main/java/pl/tpolgrabia/urbanexplorer/handlers/GooglePlacesScrollListener.java

@@ -0,0 +1,29 @@
+package pl.tpolgrabia.urbanexplorer.handlers;
+
+import android.widget.AbsListView;
+import pl.tpolgrabia.urbanexplorer.fragments.PlacesFragment;
+
+
+/**
+ * Created by tpolgrabia on 04.10.16.
+ */
+public class GooglePlacesScrollListener implements AbsListView.OnScrollListener {
+    private final PlacesFragment placesFragment;
+
+    public GooglePlacesScrollListener(PlacesFragment placesFragment) {
+        this.placesFragment = placesFragment;
+    }
+
+    @Override
+    public void onScrollStateChanged(AbsListView view, int scrollState) {
+
+    }
+
+    @Override
+    public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
+        if (firstVisibleItem + visibleItemCount >= totalItemCount) {
+            // scrolled to the bottom, loading new page
+            placesFragment.loadNextPage();
+        }
+    }
+}

app/src/main/java/pl/tpolgrabia/urbanexplorer/worker/GooglePlacesWorker.java

@@ -6,6 +6,7 @@ import android.os.AsyncTask;
 import android.view.View;
 import android.widget.ListView;
 import org.apache.http.HttpStatus;
+import org.greenrobot.eventbus.EventBus;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import pl.tpolgrabia.googleutils.callback.PlacesCallback;
@@ -53,6 +54,7 @@ public class GooglePlacesWorker extends AsyncTask<GooglePlacesRequest, Integer,
 
         for (final GooglePlacesRequest param : params) {
             lg.debug("Excuting param {}", param);
+            lg.debug("Fetching page with token {}", param.getPageToken());
             Location location = param.getLocation();
 
             Response<GooglePlaceResponse> placesResponse = null;
@@ -67,6 +69,8 @@ public class GooglePlacesWorker extends AsyncTask<GooglePlacesRequest, Integer,
                 if (placesResponse != null && placesResponse.code() == HttpStatus.SC_OK) {
                     GooglePlacesResponse response = new GooglePlacesResponse();
                     response.setPlaces(placesResponse.body().getResults());
+                    response.setNextPageToken(placesResponse.body().getNextPageToken());
+                    response.setOriginalPageToken(param.getPageToken());
                     result.add(response);
                 }
 
@@ -83,15 +87,17 @@ public class GooglePlacesWorker extends AsyncTask<GooglePlacesRequest, Integer,
     @Override
     protected void onPostExecute(List<GooglePlacesResponse> googlePlacesResponses) {
         lg.debug("Post execute {}", googlePlacesResponses);
-        final View view = placesFragment.getView();
+//        final View view = placesFragment.getView();
-        if (view == null) {
+//        if (view == null) {
-            lg.error("Fragment not attached to the view");
+//            lg.error("Fragment not attached to the view");
-            return;
+//            return;
-        }
+//        }
 
         for (GooglePlacesResponse response : googlePlacesResponses) {
-            ListView places = (ListView) view.findViewById(R.id.google_places);
+            // placesFragment.setNextPageToken(response.getNextPageToken());
-            places.setAdapter(new PlacesAdapter(ctx, response));
+            // ListView places = (ListView) view.findViewById(R.id.google_places);
+            EventBus.getDefault().post(response);
+            // places.setAdapter(new PlacesAdapter(ctx, response));
         }
     }
 }

googleutils/src/main/java/pl/tpolgrabia/googleutils/constants/GooglePlacesConstants.java

@@ -7,4 +7,5 @@ public class GooglePlacesConstants {
     public static final String GOOGLE_PLACES_BASEURL = "https://maps.googleapis.com/maps/api/place/";
     public static final Long PHOTO_MAX_WIDTH = 512L;
     public static final String GOOGLE_MAPS_PLACES_API_BASEURL = "https://maps.googleapis.com/maps/api/place/";
+    public static final String PLACES_SEARCH_TYPE = "museum";
 }